chapter 2
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Teachers Discovering Computers. Chapter 2. Communications, Networks, the Internet, and the World Wide Web. Chapter Objectives. Define communications Identify the basic components of a communications system Describe how and why network computers are used in schools and school districts - PowerPoint PPT PresentationTRANSCRIPT
Teachers Discovering ComputersIntegrating Technology and
Digital Media in the Classroom6th Edition
Teachers Discovering ComputersIntegrating Technology and
Digital Media in the Classroom
Communications, Networks, the Internet, and the World Wide Web
Chapter 2
Teachers Discovering Computers
Chapter Objectives
Define communications Identify the basic components of a
communications system Describe how and why network computers are
used in schools and school districts Explain how the Internet works
Chapter 2: Communications, Networks, the Internet, and the World Wide Web 2
Chapter Objectives
Describe the World Wide Web portion of the Internet
Explain how Web documents are linked to one another
Explain the use of Web browser software Explain how to use a Web search tool to find
information
Chapter 2: Communications, Networks, the Internet, and the World Wide Web 3
Chapter Objectives
Identify several types of multimedia products available on the Web
Explain how Internet services such as e-mail, newsgroups, chat rooms, and instant messaging work
Describe the educational implications of the Internet and the World Wide Web
Describe different ways to connect to the Internet and the World Wide Web
Describe the pros and cons of Web 2.0 tools for teachers and students
Chapter 2: Communications, Networks, the Internet, and the World Wide Web 4
What Is Communications?
A process in which two or more computers or devices transfer data, instructions, and information
Sometimes called telecommunications
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What Is Communications?
Electronic mail (e-mail) Voice mail Facsimile (fax) Telecommuting Online services Videoconferencing Internet World Wide Web
Chapter 2: Communications, Networks, the Internet, and the World Wide Web 6
Communications Networks
Basic communications system Two computers, one to send and one to receive
data Communications devices that send and receive
data A communications channel over which data is sent
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Communications Networks
Chapter 2: Communications, Networks, the Internet, and the World Wide Web 8
Communications Networks
Communications channel Transmissions media
Twisted-pair cable
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Communications Networks
Digital vs. analog signals Dial-up Modem
External modem Internal modem
Network interface cards
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Communications Networks
Local Area Networks (LAN) Covers limited geographical area Server manages resources
Wide Area Networks (WAN) Covers large geographical area Can consist of several LANs
Chapter 2: Communications, Networks, the Internet, and the World Wide Web 11
Communications Networks
Home Networks Connects multiple
computers in your home or home office
Share Internet access
Share peripherals Can be wired or
wireless
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Networking the Classroom, School, and District School network server Example classroom
Three Macintosh computers
Printer Example school network
Classrooms Administration Computer lab
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Networking the Classroom, School, and District
Chapter 2: Communications, Networks, the Internet, and the World Wide Web 14
Networking the Classroom, School, and District Example school
district Central office Various schools
Chapter 2: Communications, Networks, the Internet, and the World Wide Web 15
Networking the Classroom, School, and District Wireless schools and
classrooms Keep in touch with
family and friends from anywhere
Smart phones Handheld or netbook
computers Notebook computers
Wireless technology brings the computer lab to students
Chapter 2: Communications, Networks, the Internet, and the World Wide Web 16
Networking the Classroom, School, and District High-Speed or Broadband Access
Government works to provide high speed Internet access to classrooms
Broadband technology transmits signals at much faster speeds
Chapter 2: Communications, Networks, the Internet, and the World Wide Web 17
The Benefits of Computer Networks in Education Sharing of computer
hardware, software, and data resources
Unlimited educational resources
Communicate with other educators and students
Chapter 2: Communications, Networks, the Internet, and the World Wide Web 18
What Is the Internet?
Worldwide group of connected networks that allow public access to information and services
No single organization owns or controls Estimated over one billion users Variety of users
Chapter 2: Communications, Networks, the Internet, and the World Wide Web 19
What Is the Internet?
Chapter 2: Communications, Networks, the Internet, and the World Wide Web 20
History of the Internet
Started as a network of four computers at the University of California at Los Angeles in 1969
Advanced Research Projects Agency (ARPA) – ARPANET
More than 350 million host computers today Backbone first provided by National Science
Foundation (NSF) – NSFnet
Chapter 2: Communications, Networks, the Internet, and the World Wide Web 21
History of the Internet
Chapter 2: Communications, Networks, the Internet, and the World Wide Web 22
History of the Internet
Backbone now provided by variety of corporations Various organizations help define standards Internet2 (I2)
Extremely high-speed network Develop and test latest Internet technologies Members include more than 200 universities in the
United States, along with 115 companies
Chapter 2: Communications, Networks, the Internet, and the World Wide Web 23
How the Internet Works
Data is divided into packets Routers send packets across the Internet At the destination, the packets are reassembled
into the original message Transmission control protocol/Internet protocol
(TCP/IP) is the communications protocol used by the Internet
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How the Internet Works
Chapter 2: Communications, Networks, the Internet, and the World Wide Web 25
How the Internet Works
Internet Access Providers Have permanent connections to the Internet Provide temporary connections to individuals and
companies for a fee Regional and national ISPs Online service providers offer members only areas
Chapter 2: Communications, Networks, the Internet, and the World Wide Web 26
How the Internet Works
Connecting to the Internet Business or school network connected to the
Internet Dial-up access Cable TV (CATV) Digital subscriber line (DSL) Public Internet access point
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How the Internet Works
Chapter 2: Communications, Networks, the Internet, and the World Wide Web 28
How the Internet Works
The Internet Backbone Acts as a highway National ISPs use dedicated lines to connect
directly to the Internet Regional ISPs connect through leased lines to
national ISPs
Chapter 2: Communications, Networks, the Internet, and the World Wide Web 29
How the Internet Works
Chapter 2: Communications, Networks, the Internet, and the World Wide Web 30
How the Internet Works
Internet Addresses Numeric addresses Domain name
Domain type abbreviations Country code abbreviations
Chapter 2: Communications, Networks, the Internet, and the World Wide Web 31
How the Internet Works
Chapter 2: Communications, Networks, the Internet, and the World Wide Web 32
The World Wide Web
Started in the early 1990s
Hyperlinks Uniform Resource
Locator (URL) Hypertext transfer
protocol
Chapter 2: Communications, Networks, the Internet, and the World Wide Web 33
The World Wide Web
How a Web Page Works Hypertext Hyperlinks
Target Relative Absolute
Chapter 2: Communications, Networks, the Internet, and the World Wide Web 34
The World Wide Web
Web Browser Software Interprets HTML and displays Web pages and
enables you to link to other Web pages and Web sites
Chapter 2: Communications, Networks, the Internet, and the World Wide Web 35
The World Wide Web
Web Browser Software Interprets HTML and
displays Web pages and enables you to link to other Web pages and Web sites
Also interprets: XHTML XML CSS
Chapter 2: Communications, Networks, the Internet, and the World Wide Web 36
The World Wide Web
Chapter 2: Communications, Networks, the Internet, and the World Wide Web 37
The World Wide Web
Searching for Information on the Web Directory maintained
by a search engine company
Helps find information on the Web
Search engine Subject directory
Chapter 2: Communications, Networks, the Internet, and the World Wide Web 38
The World Wide Web
Multimedia on the Web Web pages incorporate graphics, animation, audio,
video, and virtual reality Plug-ins
Chapter 2: Communications, Networks, the Internet, and the World Wide Web 39
The World Wide Web
Multimedia on the Web Graphics
Used to enhance text-based Internet
Graphics formats
Chapter 2: Communications, Networks, the Internet, and the World Wide Web 40
The World Wide Web
Multimedia on the Web Graphics
Used to enhance text-based Internet
Graphics formats Thumbnails
Chapter 2: Communications, Networks, the Internet, and the World Wide Web 41
The World Wide Web
Multimedia on the Web Animation
Marquees Animated GIFs
Chapter 2: Communications, Networks, the Internet, and the World Wide Web 42
The World Wide Web
Multimedia on the Web Audio
MP3, WAV, WMA, RealAudio, and QuickTime
Players Streaming audio Podcasting RSS
Chapter 2: Communications, Networks, the Internet, and the World Wide Web 43
The World Wide Web
Multimedia on the Web Video
Streaming video
Chapter 2: Communications, Networks, the Internet, and the World Wide Web 44
The World Wide Web
Multimedia on the Web Virtual Reality
Simulation of real or imagined environment that appears as a three-dimensional (3-D) space
VR worlds
Chapter 2: Communications, Networks, the Internet, and the World Wide Web 45
Other Internet Services
E-mail Primary communication method for both personal
and business use E-mail programs
Mailbox Mail server
E-mail address User name
Chapter 2: Communications, Networks, the Internet, and the World Wide Web 46
Other Internet Services
FTP (file transfer protocol) FTP sites and
servers Allows file downloads
and uploads Anonymous FTP FTP programs
Chapter 2: Communications, Networks, the Internet, and the World Wide Web 47
Other Internet Services
Newsgroups and Message Boards Online area in which users conduct written
discussions about a particular subject Usenet News server Article Posting Threaded discussion Message board
Chapter 2: Communications, Networks, the Internet, and the World Wide Web 48
Other Internet Services
Chapter 2: Communications, Networks, the Internet, and the World Wide Web 49
Other Internet Services
Mailing Lists Group of e-mail names and addresses given a
single name Subscribing and unsubscribing LISTSERVs
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Other Internet Services
Instant Messaging See when one or more
people are online Exchange messages
and files Join a private chat
room Text messaging Short Message Service
(SMS)
Chapter 2: Communications, Networks, the Internet, and the World Wide Web 51
Other Internet Services
Chat Rooms Real-time conversation Chat rooms Chat clients
Chapter 2: Communications, Networks, the Internet, and the World Wide Web 52
Other Internet Services
Voice Over IP (VoIP) Also called Internet
telephony Uses the Internet to
connect calling parties Low cost magicJack
Chapter 2: Communications, Networks, the Internet, and the World Wide Web 53
Netiquette
Internet etiquette The code of acceptable
behaviors users should follow while on the Internet
Chapter 2: Communications, Networks, the Internet, and the World Wide Web 54
Internet Security
Firewall Filtering software Acceptable Use Policy (AUP)
Chapter 2: Communications, Networks, the Internet, and the World Wide Web 55
The Impact of the Internet and the World Wide Web on Education The Web is the Gutenberg
printing press of modern times
Collaboration with other teachers and students ePALS
New instructional strategies
Chapter 2: Communications, Networks, the Internet, and the World Wide Web 56
The Future of the Internet and the World Wide Web The Web will continue to evolve as the primary
communications channel for people around the world
By 2012, more than two billion wireless communication devices will be in use worldwide, and many of these products will have the ability to access the Web wirelessly
Chapter 2: Communications, Networks, the Internet, and the World Wide Web 57
Chapter Summary
Define communications Identify the basic components of a
communications system Describe how and why network computers are
used in schools and school districts Explain how the Internet works
Chapter 2: Communications, Networks, the Internet, and the World Wide Web 58
Chapter Summary
Describe the World Wide Web portion of the Internet
Explain how Web documents are linked to one another
Explain the use of Web browser software Explain how to use a Web search tool to find
information
Chapter 2: Communications, Networks, the Internet, and the World Wide Web 59
Chapter Summary
Identify several types of multimedia products available on the Web
Explain how Internet services such as e-mail, newsgroups, chat rooms, and instant messaging work
Describe the educational implications of the Internet and the World Wide Web
Describe different ways to connect to the Internet and the World Wide Web
Describe the pros and cons of Web 2.0 tools for teachers and students
Chapter 2: Communications, Networks, the Internet, and the World Wide Web 60
Teachers Discovering ComputersIntegrating Technology and
Digital Media in the Classroom6th Edition
Teachers Discovering ComputersIntegrating Technology and
Digital Media in the Classroom
Teachers Discovering Computers
Communications, Networks, the Internet, and the World Wide Web
Chapter 2 Complete